gubb · 🍓 ·

A very minimalistic javascript test runner.

Installation

Install the package with npm (or yarn)

npm install gubb --save-dev

Getting started

Defining your tests

To get started, add your first test file to the project. A test file is a javascript file, containing calls to test and assert. In this example, the file test.js is added to the root of the project.

With ESM (recommended)

Import the named exports of gubb like so:

import { test, assert } from 'gubb';

Then add your test cases.

// test.js
import { test, assert } from 'gubb';

function myFunction() {
  return true;
}

test('my first test', () => {
  const result = myFunction();

  assert('that it returns true', () => {
    return result === true;
  });
});

Running your tests

To run your test, add a test entry to the scripts section of your package.json

{
  "name": "my-package",
  "version": "1.0.0",
  "type": "module",
  "scripts": {
    "test": "node test.js"
  },
  "devDependencies": {
    "esm": "*"
  }
}

Now you can run your test suite on the command-line or in CI with

npm test

Node with --experimental-modules flag

When using the native ES module loader from node, [named exports are not available for node<12](TODO: ADD LINK)

import * as gubb from 'gubb';
const { test, assert } = gubb.default;

// Tests go here

Node, legacy

const { test, assert } = require('gubb');

// Tests go here

API

gubb exports two functions: test and assert.

test

-- The test function is used to group assertions into a test.

Syntax: test(testName: String, testFunction: Function)

Example:

test('myFunction', () => {
  // Assertions go here
});

assert

assert is used to make assertions.

Syntax: assert(description: String, conditionFunction: Function)

assert takes two parameters: a description and a condition function.

Example:

test('isNotFriday', () => {
  assert(() => {
    const isFriday = new Date().getDay() === 5;
    return isFriday;
  });
});

The condition function is the function that tests your code. In here, you add logic that assures that your code runs properly. This function should return a boolean, whether the test passed. Alternatively, if the function throws an error, the test is considered failed. If you want to throw inside this function without failing the test, use a try/catch block.

Contributing

This project was bootstrapped with TSDX.

Local Development

Below is a list of commands you will probably find useful.

npm start or yarn start

Runs the project in development/watch mode. Your project will be rebuilt upon changes. TSDX has a special logger for you convenience. Error messages are pretty printed and formatted for compatibility VS Code's Problems tab.

Your library will be rebuilt if you make edits.

npm run build or yarn build

Bundles the package to the dist folder. The package is optimized and bundled with Rollup into multiple formats (CommonJS, UMD, and ES Module).

npm test or yarn test

Runs the test watcher (Jest) in an interactive mode. By default, runs tests related to files changed since the last commit.

Inspired by this tweet by @ryanflorence